RS-422 Communication

[art260]

Hello All,

I would like to use a few NMIS-0021 with either a 32bit I/O card, or a 64bit input and a 64bit output cards. These little SBC systems are going to be used for only simple data acquisition. An embedded Apple IIe is going to be the host controller talking to the SBCs through RS-422.

I know that I will need to add the RS-422 hardware to the NMIS-0021. My question is; does the NMIS-0021 have the RS-422 protocol built in? How do the NMIS-0021s know their address?

Art

[nmitech]

There is no built-in multidrop RS-422/485 protocol on the resident language Max-FORTH. For your reference, you can use the example and the information from the appnotes below,
http://www.newmicros.com/download/appnotes/easya/eza1.html

[RMDumse]

Sounds like a pretty neat application. Those I/O cards are really a good way to get high density in an easy to use/mount system.

The Easy-A protocol for multidrop networks is written up in the link LC provided above. HC11 software examples are given. That was one of the apnotes I was most proud of having written.